cvs commit: src/sys/kern kern_event.c kern_thread.c sys_generic.c sys_pipe.c uipc_sockbuf.c src/sys/netncp ncp_rq.c ncp_sock.c ncp_sock.h src/sys/netsmb smb_trantcp.c src/sys/sys proc.h selinfo.h socketvar.h systm.h

[Jeff Roberson]

This has been hanging around for at least 6 months with various people 
using it.

I should've mentioned also that I had to change a number of places that 
try to optimize away selwakeup/selrecord calls using a flag that requires 
whether there is a waiter or not.  We used to only support one waiter, but 
now you must use SEL_WAITING to determine if this is the case.  Hopefully 
I found all of these places.

Thanks,
Jeff

On Sun, 16 Dec 2007, Jeff Roberson wrote:

> jeff        2007-12-16 06:21:20 UTC
>
>  FreeBSD src repository
>
>  Modified files:
>    sys/kern             kern_event.c kern_thread.c sys_generic.c
>                         sys_pipe.c uipc_sockbuf.c
>    sys/netncp           ncp_rq.c ncp_sock.c ncp_sock.h
>    sys/netsmb           smb_trantcp.c
>    sys/sys              proc.h selinfo.h socketvar.h systm.h
>  Log:
>  Refactor select to reduce contention and hide internal implementation
>  details from consumers.
>
>   - Track individual selecters on a per-descriptor basis such that there
>     are no longer collisions and after sleeping for events only those
>     descriptors which triggered events must be rescaned.
>   - Protect the selinfo (per descriptor) structure with a mtx pool mutex.
>     mtx pool mutexes were chosen to preserve api compatibility with
>     existing code which does nothing but bzero() to setup selinfo
>     structures.
>   - Use a per-thread wait channel rather than a global wait channel.
>   - Hide select implementation details in a seltd structure which is
>     opaque to the rest of the kernel.
>   - Provide a 'selsocket' interface for those kernel consumers who wish to
>     select on a socket when they have no fd so they no longer have to
>     be aware of select implementation details.
>
>  Tested by:      kris
>  Reviewed on:    arch
>
>  Revision  Changes    Path
>  1.114     +6 -3      src/sys/kern/kern_event.c
>  1.264     +2 -0      src/sys/kern/kern_thread.c
>  1.160     +414 -168  src/sys/kern/sys_generic.c
>  1.194     +6 -3      src/sys/kern/sys_pipe.c
>  1.173     +2 -1      src/sys/kern/uipc_sockbuf.c
>  1.16      +9 -3      src/sys/netncp/ncp_rq.c
>  1.20      +0 -105    src/sys/netncp/ncp_sock.c
>  1.7       +0 -3      src/sys/netncp/ncp_sock.h
>  1.27      +1 -79     src/sys/netsmb/smb_trantcp.c
>  1.498     +2 -3      src/sys/sys/proc.h
>  1.19      +8 -8      src/sys/sys/selinfo.h
>  1.159     +2 -0      src/sys/sys/socketvar.h
>  1.263     +0 -4      src/sys/sys/systm.h
>